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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2e1afae2911e8f72dba9cf88ef9a28bfd0c0f6df845eca1a743f3d68c7605fd' 
  AND token = 'oPk1QMqKLN+rhAVqA2Nbd3maBz2JSgyidopEKJbhd3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}